Reland #74069#74802

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bors merged 3 commits intorust-lang:masterfrom

Mark-Simulacrum:reland-74069

Aug 12, 2020

Commits on Jul 27, 2020

[experiment] ty/layout: compute both niche-filling and tagged layouts for enums.

eddyb
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Mark-Simulacrum
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compare tagged/niche-filling layout and pick the best one

erikdesjardins
authored and
Mark-Simulacrum
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document test changes

erikdesjardins
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Mark-Simulacrum
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